"Many of us experience[d] these in the beginning, and continuing to use it daily, no longer experience those symptoms."
This could be attributed to a resistance or a tolerance to the chemical. This would mean that it would increasingly take more of the compound to produce the symptoms. Look at alcohol for example. This has already been listed here as a poison. One can develope a resistance (tolerance) to this poison. People that drink all of the time don't feel anything from a couple of drinks.
"Plus, a poison shouldn't cause health *improvements*..."
No, I don't necessarily agree with this. Pharmaceutical drugs are poisons, yet they often result in reversal of symptoms.
I am not disagreeing about Miracle-Mineral-Supplement . I am just looking at this conversely to adequately examine this healing method.